import { Inject, Injectable, Injector } from '@angular/core';
import { Request } from '@angular/http';
import { RequestArgs } from '@angular/http/src/interfaces';
import { Actions, Effect, ofType } from '@ngrx/effects';
// tslint:disable-next-line:import-blacklist
import { Observable } from 'rxjs';

import { GLOBAL_CONFIG, GlobalConfig } from '../../../config';
import { isNotEmpty } from '../../shared/empty.util';
import { ErrorResponse, RestResponse } from '../cache/response-cache.models';
import { ResponseCacheService } from '../cache/response-cache.service';
import { DSpaceRESTV2Response } from '../dspace-rest-v2/dspace-rest-v2-response.model';

import { DSpaceRESTv2Service } from '../dspace-rest-v2/dspace-rest-v2.service';
import { RequestActionTypes, RequestCompleteAction, RequestExecuteAction } from './request.actions';
import { RequestError, RestRequest } from './request.models';
import { RequestEntry } from './request.reducer';
import { RequestService } from './request.service';
import { DSpaceRESTv2Serializer } from '../dspace-rest-v2/dspace-rest-v2.serializer';
import { NormalizedObjectFactory } from '../cache/models/normalized-object-factory';
import { catchError, flatMap, map, tap } from 'rxjs/operators';

@Injectable()
export class RequestEffects {

  @Effect() execute = this.actions$.ofType(RequestActionTypes.EXECUTE).pipe(
    flatMap((action: RequestExecuteAction) => {
      return this.requestService.getByUUID(action.payload)
        .take(1);
    }),
    map((entry: RequestEntry) => entry.request),
    flatMap((request: RestRequest) => {
      let body;
      if (isNotEmpty(request.body)) {
        const serializer = new DSpaceRESTv2Serializer(NormalizedObjectFactory.getConstructor(request.body.type));
        body = JSON.stringify(serializer.serialize(request.body));
      }
      return this.restApi.request(request.method, request.href, body).pipe(
        map((data: DSpaceRESTV2Response) => this.injector.get(request.getResponseParser()).parse(request, data)),
        tap((response: RestResponse) => this.responseCache.add(request.href, response, this.EnvConfig.cache.msToLive)),
        map((response: RestResponse) => new RequestCompleteAction(request.uuid)),
        catchError((error: RequestError) => Observable.of(new ErrorResponse(error)).pipe(
          tap((response: RestResponse) => this.responseCache.add(request.href, response, this.EnvConfig.cache.msToLive)),
          map((response: RestResponse) => new RequestCompleteAction(request.uuid))
        ))
      );
    })
  );

  constructor(
    @Inject(GLOBAL_CONFIG) private EnvConfig: GlobalConfig,
    private actions$: Actions,
    private restApi: DSpaceRESTv2Service,
    private injector: Injector,
    private responseCache: ResponseCacheService,
    protected requestService: RequestService
  ) { }

}
/* tslint:enable:max-classes-per-file */